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ci: let bwrap create user namespaces on the runner so the sandbox test runs - #1209
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…t runs bwrap failed with "setting up uid map: Permission denied": Ubuntu 24.04 runners block unprivileged user namespaces through AppArmor. The sandbox test skipped for that reason, so its check never ran. The setting is relaxed on the CI VM only, in the test job, and the temporary diagnostics step is removed.
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Refs #1207
Diagnosis
The diagnostics run (#1208) showed the cause on the runner:
Ubuntu 24.04 blocks unprivileged user namespaces through AppArmor, so bwrap cannot start, and the sandbox test skipped with "bwrap is not usable here".
Change
sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0. The setting applies to the CI VM only; the shipped app is not affected.Risk to watch
If the sandbox test now runs and fails, the sandbox lets a write reach the host. That is a finding to fix, not a reason to skip the test again.